It’s halftime at O.co Coliseum, where the Chiefs lead the Raiders 35-17. Here are some quick observations.

1. Jamaal Charles … just, wow. The guy racked up four touchdowns in the first half alone, which is impressive by itself. But when you consider that three of his touchdowns came on screen passes, it speaks to not only his explosiveness, but a weakness in the Raiders' defense the Chiefs identified and exploited.

2. Speaking of Charles, the guy has looked roughly 27 percent more explosive since the bye week. The myriad of injuries he was dealing with must have really taken a toll, but he looks like his old self.

3. I've written a lot about Eric Berry recently, and it's nice having a safety who can play in the box, but it's nice to see him make plays on the football. His two interceptions in the first half — one that went for a touchdown — were a nice reminder that at 24 years old, this guy has a pretty high ceiling.

4. Aside from a nice vertical throw to Denarius Moore for a 34-yard gain, that was a pretty brutal half for Oakland quarterback Matt McGloin, who finished 8 of 22 for 151 yards and two interceptions. Interestingly enough, the Chiefs didn't have a sack or a quarterback hit in the half.

5. The Chiefs are winning pretty handily and all, but it has to be said — they've also been entirely too undisciplined when it comes to penalties. So far, the Chiefs have been penalized six times for 104 yards. That doesn't make for winning football against teams more competent than the Raiders.